The BM-92A Adapator is a mount accessory and is manufactured from non-conductive material to minimise RF influence.
This device has been engineered for interfacing from ⅞ Inch UNF sockets down to ¼ Inch UNC sockets. It screws into the standard ⅞ Inch UNC sockets and then reduces the socket to ¼ Inch UNC. Typically used to convert items like 846 & 848.